Timothy Beight / Mbed 2 deprecated 6_songs-from-the-cloud

This is a fork due to permission issues

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of 6_songs-from-the-cloud by MakingMusicWorkshop

mbed-client/mbedtls/source/entropy_poll.c@1:0ddbe2d3319c, 2016-05-19 (annotated)

Committer:
timbeight
Date:
Thu May 19 16:02:10 2016 +0000
Revision:
1:0ddbe2d3319c
Parent:
0:f7c60d3e7b8a 
This is my first commit while in the class.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
maclobdell 0:f7c60d3e7b8a 1 /*
maclobdell 0:f7c60d3e7b8a 2 * Platform-specific and custom entropy polling functions
maclobdell 0:f7c60d3e7b8a 3 *
maclobdell 0:f7c60d3e7b8a 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
maclobdell 0:f7c60d3e7b8a 5 * SPDX-License-Identifier: Apache-2.0
maclobdell 0:f7c60d3e7b8a 6 *
maclobdell 0:f7c60d3e7b8a 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
maclobdell 0:f7c60d3e7b8a 8 * not use this file except in compliance with the License.
maclobdell 0:f7c60d3e7b8a 9 * You may obtain a copy of the License at
maclobdell 0:f7c60d3e7b8a 10 *
maclobdell 0:f7c60d3e7b8a 11 * http://www.apache.org/licenses/LICENSE-2.0
maclobdell 0:f7c60d3e7b8a 12 *
maclobdell 0:f7c60d3e7b8a 13 * Unless required by applicable law or agreed to in writing, software
maclobdell 0:f7c60d3e7b8a 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
maclobdell 0:f7c60d3e7b8a 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
maclobdell 0:f7c60d3e7b8a 16 * See the License for the specific language governing permissions and
maclobdell 0:f7c60d3e7b8a 17 * limitations under the License.
maclobdell 0:f7c60d3e7b8a 18 *
maclobdell 0:f7c60d3e7b8a 19 * This file is part of mbed TLS (https://tls.mbed.org)
maclobdell 0:f7c60d3e7b8a 20 */
maclobdell 0:f7c60d3e7b8a 21
maclobdell 0:f7c60d3e7b8a 22 #if !defined(MBEDTLS_CONFIG_FILE)
maclobdell 0:f7c60d3e7b8a 23 #include "mbedtls/config.h"
maclobdell 0:f7c60d3e7b8a 24 #else
maclobdell 0:f7c60d3e7b8a 25 #include MBEDTLS_CONFIG_FILE
maclobdell 0:f7c60d3e7b8a 26 #endif
maclobdell 0:f7c60d3e7b8a 27
maclobdell 0:f7c60d3e7b8a 28 #if defined(MBEDTLS_ENTROPY_C)
maclobdell 0:f7c60d3e7b8a 29
maclobdell 0:f7c60d3e7b8a 30 #include "mbedtls/entropy.h"
maclobdell 0:f7c60d3e7b8a 31 #include "mbedtls/entropy_poll.h"
maclobdell 0:f7c60d3e7b8a 32
maclobdell 0:f7c60d3e7b8a 33 #if defined(MBEDTLS_TIMING_C)
maclobdell 0:f7c60d3e7b8a 34 #include <string.h>
maclobdell 0:f7c60d3e7b8a 35 #include "mbedtls/timing.h"
maclobdell 0:f7c60d3e7b8a 36 #endif
maclobdell 0:f7c60d3e7b8a 37 #if defined(MBEDTLS_HAVEGE_C)
maclobdell 0:f7c60d3e7b8a 38 #include "mbedtls/havege.h"
maclobdell 0:f7c60d3e7b8a 39 #endif
maclobdell 0:f7c60d3e7b8a 40
maclobdell 0:f7c60d3e7b8a 41 #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
maclobdell 0:f7c60d3e7b8a 42 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
maclobdell 0:f7c60d3e7b8a 43
maclobdell 0:f7c60d3e7b8a 44 #if !defined(_WIN32_WINNT)
maclobdell 0:f7c60d3e7b8a 45 #define _WIN32_WINNT 0x0400
maclobdell 0:f7c60d3e7b8a 46 #endif
maclobdell 0:f7c60d3e7b8a 47 #include <windows.h>
maclobdell 0:f7c60d3e7b8a 48 #include <wincrypt.h>
maclobdell 0:f7c60d3e7b8a 49
maclobdell 0:f7c60d3e7b8a 50 int mbedtls_platform_entropy_poll( void *data, unsigned char *output, size_t len,
maclobdell 0:f7c60d3e7b8a 51 size_t *olen )
maclobdell 0:f7c60d3e7b8a 52 {
maclobdell 0:f7c60d3e7b8a 53 HCRYPTPROV provider;
maclobdell 0:f7c60d3e7b8a 54 ((void) data);
maclobdell 0:f7c60d3e7b8a 55 *olen = 0;
maclobdell 0:f7c60d3e7b8a 56
maclobdell 0:f7c60d3e7b8a 57 if( CryptAcquireContext( &provider, NULL, NULL,
maclobdell 0:f7c60d3e7b8a 58 PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) == FALSE )
maclobdell 0:f7c60d3e7b8a 59 {
maclobdell 0:f7c60d3e7b8a 60 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
maclobdell 0:f7c60d3e7b8a 61 }
maclobdell 0:f7c60d3e7b8a 62
maclobdell 0:f7c60d3e7b8a 63 if( CryptGenRandom( provider, (DWORD) len, output ) == FALSE )
maclobdell 0:f7c60d3e7b8a 64 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
maclobdell 0:f7c60d3e7b8a 65
maclobdell 0:f7c60d3e7b8a 66 CryptReleaseContext( provider, 0 );
maclobdell 0:f7c60d3e7b8a 67 *olen = len;
maclobdell 0:f7c60d3e7b8a 68
maclobdell 0:f7c60d3e7b8a 69 return( 0 );
maclobdell 0:f7c60d3e7b8a 70 }
maclobdell 0:f7c60d3e7b8a 71 #else /* _WIN32 && !EFIX64 && !EFI32 */
maclobdell 0:f7c60d3e7b8a 72
maclobdell 0:f7c60d3e7b8a 73 /*
maclobdell 0:f7c60d3e7b8a 74 * Test for Linux getrandom() support.
maclobdell 0:f7c60d3e7b8a 75 * Since there is no wrapper in the libc yet, use the generic syscall wrapper
maclobdell 0:f7c60d3e7b8a 76 * available in GNU libc and compatible libc's (eg uClibc).
maclobdell 0:f7c60d3e7b8a 77 */
maclobdell 0:f7c60d3e7b8a 78 #if defined(__linux__) && defined(__GLIBC__)
maclobdell 0:f7c60d3e7b8a 79 #include <unistd.h>
maclobdell 0:f7c60d3e7b8a 80 #include <sys/syscall.h>
maclobdell 0:f7c60d3e7b8a 81 #if defined(SYS_getrandom)
maclobdell 0:f7c60d3e7b8a 82 #define HAVE_GETRANDOM
maclobdell 0:f7c60d3e7b8a 83
maclobdell 0:f7c60d3e7b8a 84 static int getrandom_wrapper( void *buf, size_t buflen, unsigned int flags )
maclobdell 0:f7c60d3e7b8a 85 {
maclobdell 0:f7c60d3e7b8a 86 /* MemSan cannot understand that the syscall writes to the buffer */
maclobdell 0:f7c60d3e7b8a 87 #if defined(__has_feature)
maclobdell 0:f7c60d3e7b8a 88 #if __has_feature(memory_sanitizer)
maclobdell 0:f7c60d3e7b8a 89 memset( buf, 0, buflen );
maclobdell 0:f7c60d3e7b8a 90 #endif
maclobdell 0:f7c60d3e7b8a 91 #endif
maclobdell 0:f7c60d3e7b8a 92
maclobdell 0:f7c60d3e7b8a 93 return( syscall( SYS_getrandom, buf, buflen, flags ) );
maclobdell 0:f7c60d3e7b8a 94 }
maclobdell 0:f7c60d3e7b8a 95
maclobdell 0:f7c60d3e7b8a 96 #include <sys/utsname.h>
maclobdell 0:f7c60d3e7b8a 97 /* Check if version is at least 3.17.0 */
maclobdell 0:f7c60d3e7b8a 98 static int check_version_3_17_plus( void )
maclobdell 0:f7c60d3e7b8a 99 {
maclobdell 0:f7c60d3e7b8a 100 int minor;
maclobdell 0:f7c60d3e7b8a 101 struct utsname un;
maclobdell 0:f7c60d3e7b8a 102 const char *ver;
maclobdell 0:f7c60d3e7b8a 103
maclobdell 0:f7c60d3e7b8a 104 /* Get version information */
maclobdell 0:f7c60d3e7b8a 105 uname(&un);
maclobdell 0:f7c60d3e7b8a 106 ver = un.release;
maclobdell 0:f7c60d3e7b8a 107
maclobdell 0:f7c60d3e7b8a 108 /* Check major version; assume a single digit */
maclobdell 0:f7c60d3e7b8a 109 if( ver[0] < '3' || ver[0] > '9' || ver [1] != '.' )
maclobdell 0:f7c60d3e7b8a 110 return( -1 );
maclobdell 0:f7c60d3e7b8a 111
maclobdell 0:f7c60d3e7b8a 112 if( ver[0] - '0' > 3 )
maclobdell 0:f7c60d3e7b8a 113 return( 0 );
maclobdell 0:f7c60d3e7b8a 114
maclobdell 0:f7c60d3e7b8a 115 /* Ok, so now we know major == 3, check minor.
maclobdell 0:f7c60d3e7b8a 116 * Assume 1 or 2 digits. */
maclobdell 0:f7c60d3e7b8a 117 if( ver[2] < '0' || ver[2] > '9' )
maclobdell 0:f7c60d3e7b8a 118 return( -1 );
maclobdell 0:f7c60d3e7b8a 119
maclobdell 0:f7c60d3e7b8a 120 minor = ver[2] - '0';
maclobdell 0:f7c60d3e7b8a 121
maclobdell 0:f7c60d3e7b8a 122 if( ver[3] >= '0' && ver[3] <= '9' )
maclobdell 0:f7c60d3e7b8a 123 minor = 10 * minor + ver[3] - '0';
maclobdell 0:f7c60d3e7b8a 124 else if( ver [3] != '.' )
maclobdell 0:f7c60d3e7b8a 125 return( -1 );
maclobdell 0:f7c60d3e7b8a 126
maclobdell 0:f7c60d3e7b8a 127 if( minor < 17 )
maclobdell 0:f7c60d3e7b8a 128 return( -1 );
maclobdell 0:f7c60d3e7b8a 129
maclobdell 0:f7c60d3e7b8a 130 return( 0 );
maclobdell 0:f7c60d3e7b8a 131 }
maclobdell 0:f7c60d3e7b8a 132 static int has_getrandom = -1;
maclobdell 0:f7c60d3e7b8a 133 #endif /* SYS_getrandom */
maclobdell 0:f7c60d3e7b8a 134 #endif /* __linux__ */
maclobdell 0:f7c60d3e7b8a 135
maclobdell 0:f7c60d3e7b8a 136 #include <stdio.h>
maclobdell 0:f7c60d3e7b8a 137
maclobdell 0:f7c60d3e7b8a 138 int mbedtls_platform_entropy_poll( void *data,
maclobdell 0:f7c60d3e7b8a 139 unsigned char *output, size_t len, size_t *olen )
maclobdell 0:f7c60d3e7b8a 140 {
maclobdell 0:f7c60d3e7b8a 141 FILE *file;
maclobdell 0:f7c60d3e7b8a 142 size_t read_len;
maclobdell 0:f7c60d3e7b8a 143 ((void) data);
maclobdell 0:f7c60d3e7b8a 144
maclobdell 0:f7c60d3e7b8a 145 #if defined(HAVE_GETRANDOM)
maclobdell 0:f7c60d3e7b8a 146 if( has_getrandom == -1 )
maclobdell 0:f7c60d3e7b8a 147 has_getrandom = ( check_version_3_17_plus() == 0 );
maclobdell 0:f7c60d3e7b8a 148
maclobdell 0:f7c60d3e7b8a 149 if( has_getrandom )
maclobdell 0:f7c60d3e7b8a 150 {
maclobdell 0:f7c60d3e7b8a 151 int ret;
maclobdell 0:f7c60d3e7b8a 152
maclobdell 0:f7c60d3e7b8a 153 if( ( ret = getrandom_wrapper( output, len, 0 ) ) < 0 )
maclobdell 0:f7c60d3e7b8a 154 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
maclobdell 0:f7c60d3e7b8a 155
maclobdell 0:f7c60d3e7b8a 156 *olen = ret;
maclobdell 0:f7c60d3e7b8a 157 return( 0 );
maclobdell 0:f7c60d3e7b8a 158 }
maclobdell 0:f7c60d3e7b8a 159 #endif /* HAVE_GETRANDOM */
maclobdell 0:f7c60d3e7b8a 160
maclobdell 0:f7c60d3e7b8a 161 *olen = 0;
maclobdell 0:f7c60d3e7b8a 162
maclobdell 0:f7c60d3e7b8a 163 file = fopen( "/dev/urandom", "rb" );
maclobdell 0:f7c60d3e7b8a 164 if( file == NULL )
maclobdell 0:f7c60d3e7b8a 165 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
maclobdell 0:f7c60d3e7b8a 166
maclobdell 0:f7c60d3e7b8a 167 read_len = fread( output, 1, len, file );
maclobdell 0:f7c60d3e7b8a 168 if( read_len != len )
maclobdell 0:f7c60d3e7b8a 169 {
maclobdell 0:f7c60d3e7b8a 170 fclose( file );
maclobdell 0:f7c60d3e7b8a 171 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
maclobdell 0:f7c60d3e7b8a 172 }
maclobdell 0:f7c60d3e7b8a 173
maclobdell 0:f7c60d3e7b8a 174 fclose( file );
maclobdell 0:f7c60d3e7b8a 175 *olen = len;
maclobdell 0:f7c60d3e7b8a 176
maclobdell 0:f7c60d3e7b8a 177 return( 0 );
maclobdell 0:f7c60d3e7b8a 178 }
maclobdell 0:f7c60d3e7b8a 179 #endif /* _WIN32 && !EFIX64 && !EFI32 */
maclobdell 0:f7c60d3e7b8a 180 #endif /* !MBEDTLS_NO_PLATFORM_ENTROPY */
maclobdell 0:f7c60d3e7b8a 181
maclobdell 0:f7c60d3e7b8a 182 #if defined(MBEDTLS_TIMING_C)
maclobdell 0:f7c60d3e7b8a 183 int mbedtls_hardclock_poll( void *data,
maclobdell 0:f7c60d3e7b8a 184 unsigned char *output, size_t len, size_t *olen )
maclobdell 0:f7c60d3e7b8a 185 {
maclobdell 0:f7c60d3e7b8a 186 unsigned long timer = mbedtls_timing_hardclock();
maclobdell 0:f7c60d3e7b8a 187 ((void) data);
maclobdell 0:f7c60d3e7b8a 188 *olen = 0;
maclobdell 0:f7c60d3e7b8a 189
maclobdell 0:f7c60d3e7b8a 190 if( len < sizeof(unsigned long) )
maclobdell 0:f7c60d3e7b8a 191 return( 0 );
maclobdell 0:f7c60d3e7b8a 192
maclobdell 0:f7c60d3e7b8a 193 memcpy( output, &timer, sizeof(unsigned long) );
maclobdell 0:f7c60d3e7b8a 194 *olen = sizeof(unsigned long);
maclobdell 0:f7c60d3e7b8a 195
maclobdell 0:f7c60d3e7b8a 196 return( 0 );
maclobdell 0:f7c60d3e7b8a 197 }
maclobdell 0:f7c60d3e7b8a 198 #endif /* MBEDTLS_TIMING_C */
maclobdell 0:f7c60d3e7b8a 199
maclobdell 0:f7c60d3e7b8a 200 #if defined(MBEDTLS_HAVEGE_C)
maclobdell 0:f7c60d3e7b8a 201 int mbedtls_havege_poll( void *data,
maclobdell 0:f7c60d3e7b8a 202 unsigned char *output, size_t len, size_t *olen )
maclobdell 0:f7c60d3e7b8a 203 {
maclobdell 0:f7c60d3e7b8a 204 mbedtls_havege_state *hs = (mbedtls_havege_state *) data;
maclobdell 0:f7c60d3e7b8a 205 *olen = 0;
maclobdell 0:f7c60d3e7b8a 206
maclobdell 0:f7c60d3e7b8a 207 if( mbedtls_havege_random( hs, output, len ) != 0 )
maclobdell 0:f7c60d3e7b8a 208 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
maclobdell 0:f7c60d3e7b8a 209
maclobdell 0:f7c60d3e7b8a 210 *olen = len;
maclobdell 0:f7c60d3e7b8a 211
maclobdell 0:f7c60d3e7b8a 212 return( 0 );
maclobdell 0:f7c60d3e7b8a 213 }
maclobdell 0:f7c60d3e7b8a 214 #endif /* MBEDTLS_HAVEGE_C */
maclobdell 0:f7c60d3e7b8a 215
maclobdell 0:f7c60d3e7b8a 216 #endif /* MBEDTLS_ENTROPY_C */